患者，女，16岁，诊断为青少年牙周炎，X线片：双侧下第一磨牙近远中牙槽骨垂直吸收根长的1／2，下列哪一项体征最不可能出现（）
A.牙齿松动Ⅰ～Ⅱ度
B.牙龈退缩
C.牙龈呈实质性的增生
D.
创伤
E.根分叉病变
参考答案：C
解析：
根据患者诊断和X线表现，A、B、E选项的体征都可能出现，
创伤可能参与并加速了牙周炎的病程。所以最不可能出现的体征应为C。
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| Don't wasts time because time lost can never 1 . Time passes very quikly. Some students say they do not have 2 time to do their lessons. They don't know 3 make use of their time. They waste it in watching TV, playing games, and 4 other useless things.Why do we go to school early in the morning? Why do most people 5 buses instead of(代替) 6 ?The answer is very easy:we wish to 7 time because time is precious(珍贵). We know that time is 8 . When a man 9 , his time has finished. 10 time is short, we must give our time to our studies or work. | ||||
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